Oscillating sieve.



M. M. PORKERTL OSGILLATING SIEVE.

APPLICATION FILED AUG. 16, 1912.

Patented Jan. 7,1913.

INVENTOR WITNEssES ATTORNEY PATENT OFFICE. I

MARTIN MAX FORK'ERT,

or HAMBURG, GERMANY.

OSCILLATING SIEVE.

Specification of Letters Patent.

Patented Jan. 7, 1913.

Application filed August 16. 1912. Serial No. 715,472.

To all whom it may concern:

Be it known that I, MARTIN MAX FORK- nnr, a subject of the German Emperor, and resident of Hamburg, Germany, have invented a certain new and useful Improvement in Oscillating Sieves, of which the following is a specification.

The present invention relates to improvements in the construction of oscillating sieves whereby the meshes of the sieve are kept free from the material being sifted even when the sieves are formed of flexible material.

In apparatus of this kind hitherto employed an attempt has been made to cause the sieve cloth to vibrate continuously by arranging beneath and on the sieve cloth brackets carrying blocks, balls, rods or the like adapted to move to and fro therein. Such arrangements have not come into practical use because they injured the sieve cloth and in particular those parts to which the brackets were secured became very quickly worn out. With flexible sieves, such as, for example, horse hair or gauze sieves, these brackets could not be used at all.

In accordance with this invention the brackets are secured to the sieve frame and in order that vibration may be imparted directly to the cloth so that the meshes will be kept free, the guiding surfaces of the brackets incline upward toward the sieve cloth so that the moving rods at the ends of their path strike against the sieve cloth. Considerable vibration of the sieve cloth and thus freedom of the meshes from the material being sifted are thereby obtained.

The invention is illustrated in the accompanying drawing in which Figure 1 is a vertical section of a sieve frame provided with the improved arrangement of rod supporting brackets and Fig. 2 an inverted plan thereof.

As shown, to the frame a of the sieve and beneath the sieve cloth I) are secured by means of bolts or the like, brackets 0. In these brackets are carried round rods d movement of the sieve. The guiding faces 6 of the brackets c are inclined upward torunning on these surfaces at the ends of their path strike against upwardly inclined faces of the brackets 0 may naturally also form acute angles with the horizontal portions of the surfaces or may form in conjunction with the guiding faces 6 arcs ofcircles.

I claim:

An oscillating sieve comprising in combination with a sieve frame, a sieve cloth secured to said frame, brackets secured to said frame and rods adapted to roll to and fro within said brackets, said brackets forming guiding surfaces for said rods, inclined portions on said guiding surfaces as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARTIN MAX FORKERT.

Witnesses: p

GUSTAV Wnmonn, ERNEST H. L. MUMMENHOFF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

1 Washington, D. C.

Ward the sieve cloth I) so that the rods (2" the cloth I). The.

which move to and fro with the vibratory 

